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Black spots disease

black spot disease (GB)

This vine disease (French excoriosis) has been known for a long time and occurs worldwide in many wine regions. She was in front of the mildew in Europe the most dangerous fungal disease. She may not with the of cicadas transmitted Blackwood's disease be confused. At the beginning of the 20th century, black spot disease was probably (as a side effect) due to intensive control of downy mildew Bordeaux mixture curbed. The "black burner" mentioned in the middle of the 19th century is probably the same disease because of the symptoms. Which in some sources referred to as identical anthracnose Although similar symptoms, but by another mushroom (Elsinoe ampelina) caused. The Schwarzflecken disease was first described in 1965 in Germany Having been in the country a few years earlier palatinate occurred. It is caused by the fungus "Phomopsis viticola", which is why it is also called "Phomopsis type 2". The found in Australia "Phomopsis type 1" is for the grapevine dangerous.

Black spots disease

The infection occurs in abundant rainfall at the time of sprouting, the fungus nestles in the wood and in the bark. Spores can be caused by insects mites be transmitted. A few weeks after the infestation appear on the Scroll the significant eponymous little black spots, which are bordered by a yellowish yard. The leaves stop growing and wither. Later also show the shoots narrow black spots that were subsequently discarded. The necrotic Tissue breaks and characteristic longitudinal cracks occur. The shoots fade and in winter, black pustules are easily recognizable on these spots. The result is fancy buds ( eyes ) and thus weak yield, A fight in the vineyard must be preventive at the beginning of the growth cycle by protective fungicides respectively. After the infestation, the disease can hardly be contained. Certain grape varieties are particularly susceptible to the disease, including, among others Müller-Thurgau, See also a list of all the plagues under Vine enemies,

Black spot disease - infested shoot

Images: © LWG - Bavaria

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